ENH: clarify OpticalCalibration app by using parameter clamp instead of noclamp which was disturbing

ENH: add vfn option in ValidateImageClassifier application to be consistent with training application.

WRG: Correction of warnings: comparison between signed and unsigned integer expressions in otbDempsterShaferFusionTests and otbConfusionMatrixMeasurementsTest

BUG: Removing remaining static declarations. The static mutex has been moved to a non-template base class, while the firstTime static bool has been replaced by unregistering each factory before registering again.

BUG: Removing static declarations in template clas to fix bug #418. Two static declaration remains (not easy to remove) so the bug is not fixed yet

DOC: Adding an acknoledgement of the author for the work on Landsat TM spectral rule based classifier

BUG: Modification of MapOfClassesType and MapOfIndicesType in otbConfusionMatrixMeasurements and otbConfusionMatrixCalculator

ENH: Modification of the otbDSFusionOfClassifiersImageFilter in order to handle a vector of maps of masses of belief as input instead of confusion matrices

ENH: Modification of the templates of classes related to confusion matrices in order to handle different label types